钙钛矿(结构)
磁滞
光伏系统
材料科学
离子键合
开路电压
工程物理
电荷(物理)
光电子学
费米能级
电场
纳米技术
电压
化学物理
凝聚态物理
化学
电气工程
离子
化学工程
物理
电子
工程类
量子力学
有机化学
作者
Sandheep Ravishankar,Saba Gharibzadeh,Cristina Roldán‐Carmona,Giulia Grancini,Yonghui Lee,Maryline Ralaiarisoa,Abdullah M. Asiri,Nobert Koch,Juan Bisquert,Mohammad Khaja Nazeeruddin
出处
期刊:Joule
[Elsevier]
日期:2018-04-01
卷期号:2 (4): 788-798
被引量:195
标识
DOI:10.1016/j.joule.2018.02.013
摘要
Perovskite materials have experienced an impressive improvement in photovoltaic performance due to their unique combination of optoelectronic properties. Their remarkable progression, facilitated by the use of different device architectures, compositional engineering, and processing methodologies, contrasts with the lack of understanding of the materials properties and interface phenomena. Here we directly target the interplay between the charge-transporting layers (CTLs) and open-circuit potential (VOC) in the operation mechanism of the state-of-the-art CH3NH3PbI3 solar cells. Our results suggest that the VOC is controlled by the splitting of quasi-Fermi levels and recombination inside the perovskite, rather than being governed by any internal electric field established by the difference in the CTL work functions. In addition, we provide novel insights into the hysteretic origin in perovskite solar cells, identifying the nature of the contacts as a critical factor in defining the charge accumulation at its interface, leading to either ionic, electronic, or mixed ionic-electronic accumulation.
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